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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba1c98f4f7bf9d40dca509da57971bd304940754e9595a772970a41ad9695b0' 
  AND token = 'wF+NKccecYV+WkvGqwZRavtdUiAyKO6FmJmK/zWHBzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}